<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        *{margin: 0; padding: 0;}
    </style>
</head>
<body>
    <ul>
        <li>德玛西亚</li>
        <li>德玛西亚</li>
        <li>德玛西亚</li>
        <li>德玛西亚</li>
        <div class="demo">
            <span>hello world</span>
            <span>hello world</span>
            <em>hello</em>
            <em>hello</em>
            <em>hello</em>
            <span>hello world</span>
            <span>hello world</span>
        </div>
    </ul>
</body>
</html>
<script src="js/jquery-1.10.1.js"></script>
<script>
    $(function () {
        $("ul .demo *").css("border","1px solid #f60")
    })
</script>
